From 0f87ac234d98c68e4b2bfde6a8bcdeef3d3f54b7 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 22 Oct 2021 06:50:06 -0400 Subject: [PATCH] KVM: x86: inline kernel_pio into its sole caller The caller of kernel_pio already has arguments for most of what kernel_pio fishes out of vcpu->arch.pio. This is the first step towards ensuring that vcpu->arch.pio.* is only used when exiting to userspace. No functional change intended. Signed-off-by: Paolo Bonzini --- arch/x86/kvm/x86.c | 38 ++++++++++++++++---------------------- 1 file changed, 16 insertions(+), 22 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index d66a873f4427..524a96d26399 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7575,37 +7575,31 @@ emul_write: return emulator_write_emulated(ctxt, addr, new, bytes, exception); } -static int kernel_pio(struct kvm_vcpu *vcpu, void *pd) -{ - int r = 0, i; - - for (i = 0; i < vcpu->arch.pio.count; i++) { - if (vcpu->arch.pio.in) - r = kvm_io_bus_read(vcpu, KVM_PIO_BUS, vcpu->arch.pio.port, - vcpu->arch.pio.size, pd); - else - r = kvm_io_bus_write(vcpu, KVM_PIO_BUS, - vcpu->arch.pio.port, vcpu->arch.pio.size, - pd); - if (r) - break; - pd += vcpu->arch.pio.size; - } - return r; -} - static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size, unsigned short port, unsigned int count, bool in) { + void *data = vcpu->arch.pio_data; + unsigned i; + int r; + vcpu->arch.pio.port = port; vcpu->arch.pio.in = in; - vcpu->arch.pio.count = count; + vcpu->arch.pio.count = count; vcpu->arch.pio.size = size; - if (!kernel_pio(vcpu, vcpu->arch.pio_data)) - return 1; + for (i = 0; i < count; i++) { + if (in) + r = kvm_io_bus_read(vcpu, KVM_PIO_BUS, port, size, data); + else + r = kvm_io_bus_write(vcpu, KVM_PIO_BUS, port, size, data); + if (r) + goto userspace_io; + data += size; + } + return 1; +userspace_io: vcpu->run->exit_reason = KVM_EXIT_IO; vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; vcpu->run->io.size = size; -- 2.11.0